<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Vue监测数据改变的原理</title>
    <!-- 引入Vue -->
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<!-- 准备好一个容器-->
<div id="root">
    <h1>学校信息</h1>
    <h2>学校名称：{{school.name}}</h2>
    <h2>学校地址：{{school.address}}</h2>
    <h2>校长是：{{school.leader}}</h2>
    <hr/>
    <h1>学生信息</h1>
    <button @click="addSex">添加一个性别属性，默认值是男</button>
    <h2>姓名：{{student.name}}</h2>
    <h2 v-if="student.sex">性别：{{student.sex}}</h2>
    <h2>年龄：真实{{student.age.rAge}}，对外{{student.age.sAge}}</h2>
    <h2>朋友们</h2>
    <ul>
        <li v-for="(f,index) in student.friends" :key="index">
            {{f.name}}--{{f.age}}
        </li>
    </ul>
</div>

<script>
    const vm = new Vue({
        el: '#root',
        data: {
            school: {
                name: '尚硅谷',
                address: '北京',
                leader: '王老师'
            },
            student: {
                name: 'tom',
                // sex: '男',
                age: {
                    rAge: 40,
                    sAge: 30
                },
                friends: [
                    {name: 'jerry', age: 20},
                    {name: 'lucy', age: 18}
                ]
            }
        },

        methods: {
            addSex() {
                Vue.set(this.student, 'sex', '男')
                // this.$set(this.student, 'sex', '男')
            }
        }
    })
</script>
</body>
</html>